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PM0215 数据表(PDF) 45 Page - STMicroelectronics |
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PM0215 数据表(HTML) 45 Page - STMicroelectronics |
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45 / 91 page  PM0215 The STM32 Cortex-M0 instruction set Doc ID 022979 Rev 1 45/91 3.4.4 LDR, PC-relative Load register (literal) from memory. Syntax LDR Rt, label where: ● ‘Rt’ is the register to load or store ● ‘label’ is a PC-relative expression (see PC-relative expressions on page 39) Operation Loads the register specified by Rt from the word in memory specified by label. Restrictions In these instructions:In these instructions, label must be within 1020 bytes of the current PC and word aligned. Condition flags These instructions do not change the flags. Examples LDR R0, LookUpTable ; Load R0 with a word of data from an address ; labelled as LookUpTable. LDR R3, [PC, #100] ; Load R3 with memory word at (PC + 100). |
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